quick uuid

uuid.js

const cryptoLib = window.crypto || window.msCrypto;

const uuidv4 = () => {
    if (!cryptoLib || !Uint8Array) {
        return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
            const r = Math.random() * 16 | 0;
            const v = c === 'x' ? r : (r & 0x3 | 0x8);
            return v.toString(16);
        });
    }

    return (`${1e7}-${1e3}-${4e3}-${8e3}-${1e11}`)
        .replace(/[018]/g, (c: string) => {
            const intValue = parseInt(c, 10);
            const randomValue = cryptoLib.getRandomValues(new Uint8Array(1))[0];
            return (intValue ^ randomValue & 15 >> intValue / 4).toString(16);
        });
};